鉛プラグ内蔵型積層ゴムの履歴復元力特性と破断限界に関する実験的研究 : 上下面ボルト固定の場合

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This paper describes static test results of lead-rubber bearings using bolts for connection to the isolated superstructure and the foundation. The bearings used for the tests were 0.1- and 0.27- scale models of a 4900 kN rated load bearing which was designed for preliminary study of the seismic isolation bearings for nuclear facilities. The fundamental tests revealed various properties of the horizontal stiffness and damping obtained from the hysteretic restoring force loops. The repeated shear deformation tests showed that the bearings could keep their integrity through the 80-cycle repetition tests under a ±227% shear strain amplitude, and that the bearings had the fatigue resistance even against the 80-cycle repetition tests under a ±445% shear strain amplitude. The breaking tests by shear and compression for the bearings with and without the lead plug showed that the lead plug scarcely affected the breaking conditions of the bearings, and that the breaking shear strains were 518〜550%, corresponding to 1.14〜1.21m horizontal displacements in full size.
1991-01-25